I always am too. And from what I have gradually learned it seems quite different for everyone. I will say in general it seems an "enhancer" is anything that helps define the curl. But there are a ton of products called enhancers that people use like a leave in or use like a gel. So sadly overall it's trial and error if products to see what works best for you.
2a medium porous, You can see my wavy tutorials here: https://www.youtube.com/playlist?lis...ZNxhBHSXAW40OQ and my wavy blog is The Wavy Nation http://wavynation.wordpress.com